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East German Pat. No. 81650 issued on May 5, 1971 discloses the use of Rh(Pφ3)3Cl and a large amount of t-butyl hydroperoxide (with oxygen) for the oxidation of cyclopentene at 45° C. This reaction was slow giving 2-cyclopentenol in 7% yield along with 10% of 2-cyclopentenone.

1. customat 45° C